<template>
  <div class="app-container">
    <!-- 输入表单 -->
    <el-form label-width="120px">
      <el-form-item label="讲师名称">
        <el-input v-model="teacher.name" />
      </el-form-item>
      <el-form-item label="入驻时间">
        <el-date-picker v-model="teacher.joinDate" value-format="yyyy-MM-dd" />
      </el-form-item>
      <el-form-item label="讲师排序">
        <el-input-number v-model="teacher.sort" :min="0"/>
      </el-form-item>
      <el-form-item label="讲师头衔">
        <el-select v-model="teacher.level">
          <!--
            数据类型一定要和取出的json中的一致，否则没法回填
            因此，这里value使用动态绑定的值，保证其数据类型是number
            -->
          <el-option :value="1" label="高级讲师"/>
          <el-option :value="0" label="首席讲师"/>
        </el-select>
      </el-form-item>
      <el-form-item label="讲师简介">
        <el-input v-model="teacher.intro"/>
      </el-form-item>
      <el-form-item label="讲师资历">
        <el-input v-model="teacher.career" :rows="10" type="textarea"/>
      </el-form-item>

      <!-- 讲师头像 -->
      <el-form-item label="讲师头像">
         <el-upload
          :show-file-list="false"
          :on-success="handleAvatarSuccess"
          :before-upload="beforeAvatarUpload"
          :on-error="handleAvatarError"
          :action="BASE_API+'/admin/vod/file/upload?module=avatar'"
          class="avatar-uploader">
          <img v-if="teacher.avatar" :src="teacher.avatar">
          <i v-else class="el-icon-plus avatar-uploader-icon"/>
        </el-upload>
      </el-form-item>

      <el-form-item>
        <el-button type="primary" @click="saveOrUpdate()">保存</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>
<script>
import  teacherApi from "@/api/vod/index"
export default{
  data() {
    return {
      BASE_API: 'http://localhost:8301',
      // 初始化讲师默认数据
      teacher: {
        sort: 0,
        level: 0
      },
      saveBtnDisabled: false // 保存按钮是否禁用，防止表单重复提交
    };
  },
  created() {
    if (this.$route.params.id) {
      this.fetchDataById(this.$route.params.id)
    }
  },
  
  methods: {
    saveOrUpdate() {
        if (!this.teacher.id) {
          this.saveData()
        } else {
          this.updateData()
        }
    },
    saveData(){
      teacherApi.saveTeacher(this.teacher).then(response => {
        this.$message({
          type: 'success',
          message: response.message
        })
        this.$router.push({ path: '/teacher/list' })
      })
    },
    updateData(){
      // teacher数据的获取
        teacherApi.updateById(this.teacher).then(response => {
          this.$message({
            type: 'success',
            message: response.message
          })
          this.$router.push({ path: '/teacher/list' })
        })
    },
    // 根据id查询记录
    fetchDataById(id) {
      teacherApi.getById(id).then(response => {
        this.teacher = response.data
      })
    },
    // 上传成功回调
      handleAvatarSuccess(res, file) {
        if (res.code==20000) {
          this.teacher.avatar = res.data
          // 强制重新渲染
          this.$forceUpdate()
        } else {
          this.$message.error('上传失败 （非0）')
        }
      },

      // 错误处理
      handleAvatarError() {
        this.$message.error('上传失败（http失败）')
      },

      // 上传校验
      beforeAvatarUpload(file) {
        console.log(file);
        const isJPG = file.type === 'image/jpeg'
        const isLt2M = file.size / 1024 / 1024 < 2

        if (!isJPG) {
          this.$message.error('上传头像图片只能是 JPG 格式!')
        }
        if (!isLt2M) {
          this.$message.error('上传头像图片大小不能超过 2MB!')
        }
        return isJPG && isLt2M
      }
  },

}
</script>
<style scoped>
  .avatar-uploader .avatar-uploader-icon {
    border: 1px dashed #d9d9d9;
    border-radius: 6px;
    cursor: pointer;
    position: relative;
    overflow: hidden;

    font-size: 28px;
    color: #8c939d;
    width: 178px;
    height: 178px;
    line-height: 178px;
    text-align: center;
  }
  .avatar-uploader .avatar-uploader-icon:hover {
    border-color: #409EFF;
  }
  .avatar-uploader img {
    width: 178px;
    height: 178px;
    display: block;
  }
</style>